<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入需要评论的内容(最多120字)" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time| dateFormat}}
                </div>
                <div class="cmt-body">{{item.content}}</div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>
<script>
import {Toast} from 'mint-ui'
export default{
    data(){
        return{
            pageIndex:1,
            comments:[],
            msg:''
        }
    },
    created(){
        this.getComments()
    },
    methods:{
        getComments(){
            this.$http.get("http://localhost:3000/message?"+this.id+"?pageindex="+this.pageIndex).then(result=>{
                if(result.body){
                    // this.comments=result.body.message
                    this.comments=this.comments.concat(result.body)
                    
                }else{
                    Toast("获取评论失败")
                }
            })
        },
        getMore(){
            this.pageIndex++;
            this.getComments()
        },
        postComment(){
            //校验评论内容不能为空

            if(this.msg.trim().length===0){
                return Toast('评论内容不能为空')
            }
            
            //发表评论
            //参数1：请求的URL地址
            //参数2：提交给服务器的数据对象
            //参数3：定义提交时候，表单中的数据格式{emulateJSON:true}
            this.$http.post('http://localhost:3000/message?' + this.$route.params.id,{
                content:this.msg.trim()
            }).then(function(result){
                console.log(this.$route.params.id)
                if(result.body){
                    var cmt={
                        user_name:'匿名用户',
                        add_time:Date.now(),
                        content:this.msg.trim()
                        };
                        this.comments.unshift(cmt);
                        this.msg=""
                }
            })
        }
    }
}
</script>
<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size:14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin:5px 0;
        .cmt-item{
            font-size:13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height:35px;
                text-indent: 2em;
            }
        }
    }
}
</style>
